Lamp socket with printed circuit mounting



Feb. 25, 1958 R. WOOFTER 82 ,0 8

LAMP SOCKET WITH PRINTED CIRCUIT MOUNTING 7 Filed Nov. '7. 1956 2Sheets-Sheet l I 4s 2s I I 5 h! u n I) I as INVENTOR. Robert 6. Woof/erHis A f/orney Feb. 25, 1958 R. c. WOOFTER 2,825,038

LAMP SOCKET WITH PRINTED CIRCUIT MOUNTING Filed Nov. 7, 1956 2Sheets-Sheet 2 1 INVENTOR. Robert 6. Wooffer H/ls Alla/nay United StatesPatent LAMP SOCKET WITH PRINTED CIRCUIT MOUNTING Robert C. Woofter,Cortland, Ohio, assignor to General Motors Corporation, Detroit, Mich.,a corporation of Delaware Application November 7, 1956, Serial No.620,890

13 Claims. (Cl. 339*17) This invention relates to a lamp socket adaptedfor use with printed circuits, and particularly to a lamp socket to beinserted in an opening in a panel containing a printed circuit, thepanel being used for the instrument cluster on a motor vehicle, forexample, serving to support light bulbs that illuminate variousinstruments, such as ammeters, pressure gauges of various sorts andother indicating devices.

A purpose of the present invention is to provide a new wireless lampsocket adapted for mounting with an apertured panel having a printedcircuit on one side electrically engaged by terminal strips or resilientfingers secured in insulated positions with the socket to connect anelectric light bulb.

Another object is to provide a wireless lamp socket housing ofinsulating material formed with one bayonet slot in a sidewall portionthereof and with a second bayonet slot formed by a terminal stripengageable in an insulated position with the housing so that a lamp bulbwith bayonet projections is electrically connectable through a pair ofterminal strips to an insulating board having a printed circuit thereonthrough rotative bayonettype engagement of locking projection arms ofthe housing with slots of the insulating board.

Another object is to provide a lamp socket housing with bayonet-typelocking lugs formed integral therewith and rotatably engageable withslots formed peripherally about a hole in an insulating board having anelectrically conductive printed circuit type material on one side sothat a wireless connection is effected between the printed circuitmaterial and a lamp bulb through a pair of terminal strips engageablethrough bayonet fastenings both to the bulb and printed circuitmaterial.

A further object is to provide a wireless lamp socket having a pair ofconductive terminal strips, each slidably engageable in longitudinallyextending slots of the socket with locking engagement between theterminal strips and slots provided by resilient prongs or spearprojections on the terminal strips as the strips are inserted from oneend of the socket leaving bent-over terminal portions free at theinsertion end of the socket and completely insulating these terminalportions between a printed circuit board and a radial shoulder of thesocket near the insertion end.

Another object is to provide a wireless lamp socket for use with printedcircuits to be inserted in an opening in a panel usable for aninstrument cluster on a motor vehicle to eliminate excessive wiringconnections behind a dashboard and to simplify lamp socket insertions inlocations difiicult to reach while providing bayonet-type locking lugswith the socket of the insulating material formed to provide a radialshoulder having cutout portions with a longitudinally extending wallportion or stop connected between the shoulder and a lug or abutmentmember with a curvilinear longitudinal cross section toward the cutoutto provide resilient engagement with the printed circuit by pushing thelamp socket into place and turning it a few degrees rotatably until thestop engages a peripheral edge of the opening in the panel.

Further'objects and advantages of the present invention will be apparentfrom the following description, reference being had to the accompanyingdrawings wherein a preferred embodiment of the present invention isclearly shown.

In the drawings:

Figure 1 is a side or elevational view of a socket constructed inaccordance with the present invention.

Figure 2 is a bottom view of the socket in Figure 1.

Figure 3 is a cross-sectional elevational view taken on the line 3-3 ofFigure 2.

Figure 4 is a cross-sectional elevational view of the lamp socket on theline 4-4 of Figure 2, together with a phantom representation of anelectric light bulb and base, together with a pair of terminal stripsconnectable to an insulating board with a printed circuit thereon asindicated.

Figure 5 is a cross-sectional elevational view taken on the line 55 ofFigure 2.

Figure 6 is a cross-sectional elevational view of the socket taken onthe line 6-6 of Figure 2.

Figure 7 is an end or top view of the lamp socket of Figure 1.

Figure 8 is a side projected view showing a locking lug or projectionviewing the socket from one side of Figure 7.

Figure 9 is a developed or blank view showing detail of one terminalused in the lamp socket.

Figure 10 is a side elevational view of a terminal or contact shapedfrom the structure of Figure 9 for use in the lamp socket.

Figure 11 is a modified version of the terminal which can be shaped fromthe structure of Figure 9 differing from that in Figure 10 in anS-shaped contact portion.

Figure 12 is a developed or blank view of a second terminal structureused with the socket.

Figure 13 is a side elevational view of the terminal or groundingcontact formed with the structure of Figure 12.

Figure 14 is a plan view of a lamp socket in assembled relationship withan insulating board having a printed circuit on one side showing thecombination of elements in the present invention.

The objects are accomplished according to the present invention by theprovision of a lamp socket formed of nylon, Teflon, Bakelite or someother suitable hard plastic, which is, itself, supported directly withan insulating board having a printed circuit material on one sidethereof. The socket, as shown in Figure 1, includes a body portion 20from which a flange or radial shoulder 22 integral therewith projectsradially outwardly to be engageable with an insulating board or panel,as will be described later. Also integral with the body portion 20 andextending axially from the body portion on the opposite side of theflange 22 are a pair of locking projection arms or lugs 24 and 26. Theselugs are formed to cooperate with slots in a bayonet type fastening withthe printed circuit panel, as will be described. Figure 1 also shows ina wall 28 of the body portion 20 a bayonet slot 30 having an axialportion 32 and a transverse portion 34 which is adapted to be engaged bya pin 36 of a lamp bulb base 38 shown in phantom assembled with thesocket. The cooperation of the pin 36 and bayonet slot 30 occur in aconventional manner.

Figure 2 shows a pair of diametrically opposite cutout portions 40 and42 formed with the flange 22 to form bayonet slots in conjunction withthe locking projecting arms 24 and 26 of Figure 1. These cutouts 40 and42 permit resilient engagement of arms 24 and 26 relative to flange 22when the arms cooperate with the printed circuit panel, as will bedescribed. Figure 2 also shows 3 the axial portion 32 of the bayonetslot 30 formed with the socket to cooperate with the lamp bulb.

Figure 3 is a cross-sectional elevational view taken on line 33 ofFigure 2 to show a chamber 44 formed inside the body portion 20 of thesocket adapted to receive the base 38 of the electric light bulb. Figure3 shows the bayonet slot 30 formed with the body portion and also showsa cross-sectional view of an axially extending semi-circular wall 46having a tapered outer periphery formed integral with the lockingprojection arm 26 to provide a spacing means for insulating andseparating the base 38 of the lamp bulb from possible contact withconducting portions of the printed circuit panel into which the socketis fitted when assembled as explained below. The chamber 44 is ofsubstantially the same diameter throughout except for an inwardlyprojecting annular portion 48 formed with tapered portions 50 and 52extending radially inwardly for a short distance to provide a supportagainst undesired movement of a terminal to be inserted in the socketand also to provide a stop or limit through the tapered portion 52cooperable with the bayonet slot 30 to arrest excessive insertion of thelamp bulb base 38 into the chamber 44.

Figure 4 is another cross-sectional elevational view to show furtherstructural details of the socket and bulbreceiving chamber. This viewincludes a phantom representation of a terminal or contact, generallyindicated by the numeral 56, which is shown alone in Figure 10. Thechamber 44 is provided with a longitudinally extending groove or recess58 to receive an axially extending portion 60 of the terminal 56. AU-shaped or curved portion 62 of the terminal 56 extends into thechamber 44 andis resiliently supported in a bend portion 64 by thebottom 66 of the socket. Figure 4 also shows a radially extending recess68 formed in alignment with the recess 58 to receive a bent-over contactportion 70 of the terminal 56. This bent-over portion 70 is engageablewith a conducting material 72 of a printed circuit on an insulatingboard or panel 74 having an aperture 76 adapted to cooperate with theaxial wall 46 formed with the socket. As mentioned above, the wall 46helps to align the socket relative to the panel and also to separateconducting material, such as 72, from possible engagement with thecylindrical base 38 indicated in phantom for the lamp bulb. The base maybe of the conventional type formed of brass to constitute one contact ofthe bulb while a second contact 78 is separated from the base byinsulating material 80, as indicated in the phantom representation ofthe bulb. The second contact 78 is resiliently engageable with a freeend 82 of the terminal 56 to provide electrical connection through thebent-over portion 70 to the printed circuit 72. Also indicated inphantom is a portion of a second or ground terminal, generally indicatedby the numeral 84, shown alone in Figure 13 in further detail. A secondpin 86 projecting radially outward from the lamp bulb base 38 isengageable with a bayonet 88 formed with the terminal 84. Engagement ofthe pin 86 with terminal 84 serves to ground connect the bulbelectrically through a bent-over port1on 90 of the terminal engageablewith printed circuit material 92 on the insulating board 74 in alocation separated from the printed circuit material 72 contacted bybent-over portion 70 of terminal 56.

Figure is a cross-sectional elevational view of the socket taken throughthe bayonet slot 30 to show the wall structure 28 and body portion 20 ofthe socket more clearly in relation to the radial shoulder 22 andsemi-cylindrical wall 46. Figure 5 more clearly shows the recess 58 forreceiving terminal 56, as well as the radial recess 68 in the flange 22.It is clear that the lock ng projection arm or lug 24 is separatefromthe semi-cylindrical axial wall 46 because of radial openmgs 100 and 102at opposite sides of the lug 24. These openings permit insertion ofterminals 56 and 84 into i above.

over portions, such as 70 and 90, of these terminals can then extendradially outwardly over the recesses, such as 68, provided in the flange22 for engagement with the printed circuit material, such as 72 and 92.The cross-section of Figure 5 runs directly through the center of arecess 104 for receiving the second terminal 84, and the radial recess106 receives the bent-over portion 90 of this terminal.

Figure 6 is a cross-sectional elevational view through the body portionand locking projecting arms 24 and 26. This view further shows how theaxial wall 46 is formed integral with the arm 26 and shows the taperedportion 52 limiting insertion of the bulb base 38, as mentioned It canbe seen that the lugs 24 and 26 are axially spaced from the flange orshoulder 22 a sufficient amount to accommodate the thickness of theinsulating panel 74 when the socket is rotated to form a bayonetfastening with the panel.

. Figure 7 is a forward or top end view of the socket in the presentinvention showing the semi-cylindrical shape of Wall 46, the cutouts and42, as well as projecting arms 24 and 26. The axial recesses 58 and 104are clearly visible and the radially inwardly projecting portion 48having the tapered portion 52 can also be seen at one side of thechamber 44. The axial portion 32 of the bayonet slot extends radiallythrough the wall portion 28 of the socket, as described with Figure 1.

. n The recesses 68 and 106 aligned with recesses 58 and to receivelongitudinal portions, such as 69 with terminal recesses, such as recess58, for terminal 5 T W 56 into locking engagement with the body portionof the socket. The locking engagement of the terminals in cooperationwith these guide slots of the socket body will be described in furtherdetail below.

Figure 8 is a side projected view taken from Figure 7 to show furtherdetail of the locking lug 24. As was mentioned before, the locking lug24 is designed to engage the panel or insulating board 74 with a bayonettype fastening due to axial spacing relative to the flange v 22. Anarcuate portion 112 is shown in Figure 8 extending toward the flange 22near cutout portions 40 and 42 so as to provide a resilient bayonetlocking action relative to the board 74. Extending axially from the lug24 from one end of the arcuate portion 112 integral with the flange 22is a web stop or longitudinally extending limit 114 to assure that thesocket cannot be rotated more than a few degrees. This limitation to thebayonet interlocking rotation of the socket with the panel is providedso that it will not be possible to rotate bent-over portions 70 and ofthe terminals in excess so as to cause unwanted shorting due to theterminals across separate printed circuit portions 72 and 92,respectively.

Figure 9 is a developed or blank view of the terminal 56, shown inFigure 10, and assembled in phantom with the socket in Figure 4. Asindicated with Figure 4, the terminal 56 has a bent-over portion 70,which is shown flat in Figure 9, to be connected with an axially orlongitudinally extending portion 60. The portion 66 is of slightlygreater width than the portion 70 so as to cooperate with the guideslots 118 of recesses 58 and 104 for receiving terminals 56 and 84,respectively. One side of the slightly wider portion 60 is provided witha resilient prong 118 formed by a slot having a substantially radialportion 120 and longitudinal portion 122 with the terminal 56. Theresilient prong terminates at its free end in a barb or tang 124designed to bite or grip into the body portion 20 of the socket uponinsertion into the guide slot 110. Another wider portion 126 is formedextending from the portion 60 opposite to the barb 124 to further aid inthe gripping action with the guide slots 110, Figure' 10 shows how theterminal 56 is bent into a U-shaped structure, as described with Figure4, for the purpose of resiliently connecting a contact of light bulb tothe printed circuit, as described above.

Figure 11 is a slightly modified version of the terminal in Figures 9and 10 providing an S-shaped rather than a U-shaped structure with thetongue or contact portion 128 of the terminal 56. It is to be understoodthat increased resilience and locking action of the terminal is providedby this S-shaped structure formed by using a longer tongue 128 with theterminal 56 so that there is lateral cooperation between the tongue 128with the tapered portion 59 of the radially inwardly extending sideportion 48 in chamber 44. This lateral cooperation can be bestvisualized in the view of Figure 7. It is to be understood that theterminal 56 is inserted with the barbs 124 and 126 engaging guide slots110 in recess 58 with the tongue 1'28 engageable with the taperedportions 50, as shown. For purposes of clarity and to avoid confusionconcerning the structures of the elements involved, the terminal 56 isnot shown either in phantom or in actual structural relationship withthese portions 50.

Figure 12 is a developed or blank View of the second terminal used withthe socket of the present invention and indicated generally by thenumeral 84 in the description of Figure 4. This terminal is shown in aside elevational view by Figure 13 and includes the bentover portion 90which is attached by a neck portion 130 to a central or axial portion132 having an opening or rectangular slot 134 therein. The blankindicates a flat relationship of this central portion 132 relative tothe bent-over portion 90 but it is to be understood that for purposes ofengaging the guide slots 110 of the recess 104, it is necessary to formthe central portion into a bent-over longitudinal edge 136, as shown inFigure 13. This bent-over edge may include a fiat flange portionattached to a substantially U-shaped configuration of the centralportion connected by a web 138, as indicated in Figure 13. Bending overthe edges so as to form this web will result in forming a slot 140 fromthe opening 134 so as to provide the bayonet slot indicated as thenumeral 88 in the phantom view of Figure 4. Thus, by insertion of theterminal 84 into the recess 104 of the socket, the bayonet fastening toreceive projection 86 of the bulb of Figure 4 is provided complementaryto the bayonet slot 30 in the body portion 20 cooperable with theprojection or pin 36 of the bulb. It is to be understood that formationof the web 133 with the terminal 84 transverse to the longitudinalportion 132 will result in a decrease in the width of the centralportion 132 such that a locking portion, generally indicated by thenumeral 150, attached to the central portion through a neck 152 will beslightly wider than the width formed with the edges 136. This lockingportion 150 is provided with a resilient prong 154 similar to theresilient prong 118 of terminal 56. A barb 156 is formed at the free endof the prong 154, as determined by lateral slot portion 158 andlongitudinal slot portion 160 forming the prong 154. The barb 156 actssimilar to the barb 124 by cooperating with the guide slots 110 in theundercut portion of recess 104 to retain the terminal 84 in lockedengagement with the socket.

Figure 14 is a plan view of a fragment of an insulating board or panel,such as 74, indicated with Figure 4 including printed circuit conductingportions 72 and 92 in spaced relationship to each other on one side ofthe board. A socket is shown connected to the panel 74 in one hole, suchas 76, and it is to be understood that a lacquer coating may be providedto cover both the panel and printed circuit material on the one side soas to prevent short-circuiting of portions 72 and 92 anywhere on theboard. Only areas immediately adjacent the holes, such as 75, are leftuncoated for good electrical contact with bent-over portions, such as 70and 90, of

the terminals used with the subject socket, for example.

Figure 14 also shows a plurality of upwardly extending prongs, generallyindicated by the numeral 170, for connection to lead-in wires from abattery or other electrical source connected with the printed circuit.These prongs may be grouped in a circular manner, as indicated, so thata suitable prong may be attached thereto in a conventional manner, suchas is well known in radio tube connections, for example. It is possiblethat any one or more of these prongs may be used as a ground connectionrather than a battery connection in conjunction with either printedcircuit material 72 or 92. However, it is also possible for a portion ofconducting material, such as 72, to be so attached or formed with thepanel 74 as to form an annular portion 172, which is also free oflacquer or similar insulating coating. This annular portion 172 may bedisposed about a hole 176 in the panel 74 for receiving a mounting boltor securing means for rigidly attaching the panel 74 to a metal piece,such as a dashboard of an automobile in the passenger compartment. Withproper mounting of the dashboard with the remainder of an automobilebody, the portion 172 can serve as a ground connection to the source.

Figure 14 also shows a pair of radial slots, such' as represented by thenumeral 180, in conjunction with the holes 76. The slots are at oppositepoints in order to receive the locking lugs 24 and 26 of the lamp socketin a bayonet-type fastening. The stop portion 114 shown in Figure 8integral between the locking projection 24 and flange or shoulder 22 ofthe socket can strike against a side edge 132 of any one of these slots180, for example, to limit rotative movement of the socket relative tothe panel 74. It is to be understood that the lamp socket fits into thecircular hole 76 with the slots 180 out out at diametrically oppositepoints in order to receive the locking lugs 24 and 26. As the lampsocket is pushed into place and then turned clockwise orcounterclockwise a few degrees, depending upon location of the stop 114,a bayonet fastening occurs between the socket and panel as the lockingarms engage the periphery of the hole through arcuate portion, such as112 on lug 24. The socket is purposely shown in Figure 14 locked inplace relative to a portion of the printed circuit board to show howdifferent parts cooperate and it is believed that Figure 4 with thephantom representation of the board, bulb and terminals together withthe structure of the socket clearly shows how the socket and printedcircuit mounting is achieved in accordance with the present invention.The panel of insulating material 74 may contain the necessary circuitwiring for an instrument cluster of a motor vehicle.

While the embodiment of the present invention as herein disclosedconstitutes a preferred form, it is to be understood that other formsmight be adopted.

What is claimed is as follows:

1. In combination, comprising, an insulating panel having a printedcircuit conducting material on one side thereof and at least one holetherethrough with slots cut out at peripherally spaced portions of thehole, a wireless electric lamp socket formed of suitable insulatingmaterial having a chamber formed therein adapted to receive a base of anelectric light bulb, a radially outwardly extending shoulder formed withsaid socket, said shoulder and chamber having recesses therewith, a pairof terminal strips insertable from one end of said socket into therecesses, a bent-over portion on each of said strips extending betweensaid shoulder and said panel in electrical conducting contact with saidprinted circuit conducting material to complete an electrical circuitthrough the electric lamp bulb insertable in said socket, and bayonetfastening lugs extending axially of said socket cooperable with theslots cut out at peripherally spaced portions of the hole in said panel,said lugs locking said socket to said panel as the socket is pushed intoplace and turned axially.

2. In combination, including, an insulating board havegseauss ing aprinted circuit conducting material on one side thereof in separateportions terminating peripherally at opposite sides of .edges of a holeextending through said board, an electric lamp socket free of electricalwires, said socket formed of suitable insulating material havingachamber formed therein to receive a base of an electric light bulbinsertable from one end of said socket, a pair of terminal stripsinsertable from the same end of said socket, a resilient prong laterallyextending from each strip cooperable with a cut-out guide slot portionof an axial recess formed for each strip in a chamber within saidsocket, said prong gripping said socket to position said stripswith abent-over portion of each of said strips between said socket and saidprinted circuit conducting material at opposite sides of the edges ofthe hole in said board, and projecting arms extending from said socketthrough slots at diametrically opposite portions of the hole of saidboard to lock said socket and board in cooperating relationship.

3. A lamp socket and printed circuit mounting for use in aninstrumentcluster on a motor vehicle to support light bulbs .free of lead-inelectric wires, comprising, in combination, a lamp socket free ofelectric wires and formed of suitable insulating material with a chambertherein adapted. to receive a base of an electric light bulb, saidsocket having one closed-off end and an open end through which the bulbis inserted, the open end being surrounded by a shoulder extendingradially of said socket and having radial recesses therein, the chamberin said socket having a pair of longitudinally extending recessesaligned with the radial recesses with the longitudinal recesses undercutlaterally to form guide slots therewith, a pair of terminal stripsinsertable in the longitudinal recess and guide slots, each of saidstrips including a bent-over end portion inserted in the radial recessof said shoulder, and an insulating board having a printed circuitconducting material on one side thereof immediately adjacent each ofsaid bent-over end strip portions, said board having a hole therethroughto admit passage of said socket with an inserted light bulb intomounting engagement, said shoulder and said board serving to sandwichseparated portions of the printed circuit conducting material intoelectrical conducting engagement against said bent-over end stripportions so that electrical wiring with said socket is eliminated.

4. A lamp socket, comprising, a body of electrical insulating materialhaving a substantially cylindrical chamber portion therein to receivethe base of a lamp bulb, the chamber being closed on" at one end andopen at its opposite end, a radially extending shoulder formed with saidbody adjacent the open end with radially extending recesses in saidshoulder, a tapered-edge and radiallyinwardly-extending portion of saidbody located in said chamber for limiting inserting movement of the bulbinto the chamber, a pair of laterally undercut longitudinal and radiallyoutwardly extending recesses located aside from said tapered-edgeportion, a first terminal strip insertable in one of said undercutrecesses including a curved tongue portion of said first strippositioned laterally of said tapered-edge portion, said strip alsoincluding a bent-over end portion fitting into one of the radiallyextending recesses in said shoulder, a second terminal strip in thesecnd of said pair of undercut recesses and also including abe'nt-overend portion fitting into another of the radially extendingrecesses in said shoulder, and bayonet fastening means formed with oneof said strips complementary to a bayonet slot formed with said socketfor mounting the lamp bulb, said strips eliminating all electricalwiring from said socket to permit electrical connection to the bulbthrough said bent-over end portions with said shoulder.

-5. A lamp socket, comprising, a body of electrical insulating materialhaving a chamber portion therein to receive the base of a lamp bulb, thechamber being closed off at one end by said insulating body and open atits opposite end, a shoulder formed with said body adjacent the openend, a pair of locking projection arms protruding axially of said bodyon a side of said shoulder opposite the closed chamber end, and a pairof terminal strips extending from bent-over end portions on saidshoulder to the inside of the chamber secured by inser tion axially intoundercut longitudinal recesses in the body chamber, said strips insidethe chamber electrically connecting with insulation-separated contactportions of the bulb, said protruding arms having a cross-sectionproviding a surface am'ally spaced from said shoulder for mounting saidbody and said strips against a printed circuit material thus keeping thelamp socket free of electrical wiring.

6 The lamp socket of claim 5 in which each of said terminal strips has aresilient barbed prong extending laterally therefrom to be in bitingengagement with guide slots formed with the undercut longitudinalrecesses.

7. The lamp socket of claim 5 in which at least one of the protrudinglocking arms has a curvilinear portion in the cross section of the armon a surface axially spaced from said shoulder to resiliently mount saidsocket against the printed circuit material.

8. The lamp socket of claim 7 wherein a limiting stop web is formedextending integrally from one end of said curvilinear portion in alongitudinal direction to said shoulder so as to permit rotation of onlya few degrees in securing said terminal strip bent-over portions inelectrical engagement with printed circuit material.

9. A lamp socket, comprising, in combination, a body of electricalinsulating material having a chamber portion therein to receive the baseof a lamp bulb, the chamber being closed off at one end by saidinsulating body in a floor portion and open at its opposite end, ashoulder formed with said body about the open end, a pair of lockinglugs protruding axially from said body on a side of said shoulderopposite the closed chamber end, and a pair of terminal strips extendingfrom bentover end portions formed therewith fitted against said shoulderto the inside of the chamber, said strips having a mid section slightlywider laterally than said bentover end portions to secure said strips tosaid body by gripping of the mid section into undercut longitudinalrecesses in the body chamber, said strips inside the chamberelectrically connecting with insulation-separated contact portions ofthe bulb respectively, said lugs having a cross-section providing asurface axially spaced from said shoulder for mounting said body andsaid strips against an apertured panel having a printed circuitconducting material thereon immediately adjacent said bent-over endportions thus keeping the lamp socket free of electrical wiring.

10. The combination of claim 9 wherein one of said terminal strips at anend opposite the bent-over end portion has a tongue curved to a U-shapedcontact end resiliently engageable between a fioor portion of saidsocket and one contact of the lamp bulb, said other of the pair ofstrips having bent-over webs terminating in longitudinal edges fittinginto gripping engagement into undercut longitudinal recesses in the bodychamber, said mid section having a slot serving as one part of a bayonetfastening complemented by a bayonet slot in a sidewall of the socket forengaging the light bulb.

11. The combination of claim 9 wherein one of said terminal strips at anend opposite the bent-over end portion has a tongue curved to anS-shaped contact resiliently engageable between a floor portion of saidsocket and a first contact of the lamp bulb, said other of the pair ofstrips engaging another conducting portion of the bulb insulated fromthe first contact thereof.

12. A lamp socket and printed circuit mounting for use in an instrumentcluster on a motor vehicle to support light bulbs free of lead-inelectric wires, comprising, in combination a lamp socket formed ofsuitable insulating material with a chamber therein adapted to receive abaseof an electric light bulb, said socket having one closed-01f end andan open end through which the bulb is inserted, the open end beingsurrounded by a shoulder extending laterally at an angle to the axis ofsaid socket, a pair of terminal strips attached to said socket withinthe chamber, each of said strips including an end portion bent over ontosaid shoulder, and an insulating board having a conducting material onone side thereof immediately adjacent each of said bent-over end stripportions, said board having a hole therethrough to admit passage of saidsocket with an inserted light bulb into mounting engagement, saidshoulder and said board serving to sandwich separated portions of theconducting material on said board into electrical conducting engagementagainst said bent-over end strip portions.

one end by said insulating body and open at its opposite end, a shoulderformed with said body adjacent the open end, a pair of lockingprojection arms protruding from said body on a side of said shoulderopposite the closed chamber end, and a pair of terminal strips extendingfrom bent-over end portions on said shoulder to the inside of theshoulder, said strips being attached to said socket insulating body andlocated within the chamber and electrically connecti-ble withinsulation-separated contact portions of a bulb, said protruding armshaving a cross section providing a surface axially spaced from saidshoulder and cooperating therewith to provide for mounting of said bodyand said strips against a printed circuit material on a mounting panelto keep the lamp 13. A lamp socket, comprising, a body of electrical 15socket f ee of l i l i i insulating material having a chamber portiontherein to receive the base of a lamp bulb having insulation-separatedcontact portions, the chamber being closed off at No references cited.

